纤维布加固填充墙钢筋混凝土框架的抗震性能水准研究

为研究纤维布（Fiber-Reinforced Polymer, FRP）加固对填充墙钢筋混凝土（RC）框架抗震性能水准的影响，利用数值模拟验证后的有限元建模方法，分别对未加固及FRP加固后的1000个随机结构模型进行了Pushover分析，最终基于各极限状态下层间位移角的统计分析结果，建立了FRP加固前后填充墙RC框架针对不同极限状态的量化划分准则。不同加固方案的分析结果表明：FRP仅加固框架梁、柱对框架轻微破坏状态影响不大，但会大幅度提高框架中等、严重和倒塌破坏的延性水平，且提高幅度随着框架柱包裹FRP层数的增加而增加；FRP仅加固填充墙并不能改善填充墙在轻微和中等状态的延性水平，但可以明显改善填充墙在严重和倒塌状态下的延性水平；FRP同时加固框架和填充墙可以提高各自的延性水平。

A study on the seismic performance level of masonry-infilled RC frames retrofittd by FRP

To study the influence of FRP retrofit on seismic performance level of masonry-infilled RC frames, the pushover analysis for one thousand random structural models with and without FRP strengthening, respectively, was firstly conducted using the verified finite element modeling method. Finally, based on the statistical analysis of the interstory drift ratio for different limit states, the quantitative classification criteria for different limit states of masonry-infilled RC frames before and after FRP retrofitting was established. The analysis results of different rehabilitation schemes showed that: FRP retrofit of beams and columns only had little effect on the slight damage state of the frame, but it could greatly improve the ductility level for moderate, severe and collapse damage states of the frame, and the improvement degree increased with the increase of the number of FRP wrapping layers used for frame columns; FRP retrofit of masonry infills only could not improve the ductility level for slight and moderate damage states of the infill wall, however, it would obviously improve the ductility level of severe and collapse damage states; the ductility level of the frame and the infill were both improved when they were retrofitted with FRP at the same time.